You're able to judge the fairness of the price without having tried the product?
We have quite a few paying customers, and I think they'd say it's worth it because it helps them think and be creative in a way that no other tool does.
But obviously that's a decision that's up to each person, and we offer a free tier so you can find out for yourself.
Happily we're a small team, so we only need a few thousand customers at this price to make it sustainable.